Haploids are more suitable for mutation studies than the diploids. This is because
Haploids are reproductively more stable than diploids
Mutagens penetrate in haploids more effectively than in diploids
Haploids are more abundant in nature than diploids
All mutations whether dominant or recessive are expressed in haploids
The average ratio of male to female individuals based on $XX$ and $XY$ type of sex determination, in total world of human population is
$A$ : Pseudoalleles are actually closely linked genes.
$R$ : These can be identified easily as both affect different characters, providing separate phenotypes
Absence or excess or abnormal arrangement of one or more chromosomes results in
In Cooley's Anemia, the affected chain of a haemoglobin is
Crossing over is advantageous because it brings about